This is a great tool for its price. This bike computer odometer speedometer has many useful functions. It is also very durable even after thousands of mile usage the battery lasts for several thousand miles. It helps in tracking your training progress in real time. Easy operation and durability makes it popular with riders. You can control your riding every moment. No back light functions: sdp : current speed odo : odometer dst : trip distance mxs : maximum speed avs : average speed tm : elapsed time clk : clock (12h/24h) scan "+""-" comparator setting speed scale(km/h.M/h) setting tyre circumference:(0mm-9999mm) freeze frame memory auto : on/off note : sensing distance of the probe and the magnet holder 2-5 mm size : 46 46 15mm net weight : 67gms package weight : 77gms colour : black + red quantity : 1 set/ piece battery : included package includes : 1 x bike computer console 1 x universal sensor bracket(with 85cm cable) 1 x wheel magnet 1 set cable tie 1 battery installed